Fresh install of D7.15, fresh Omega 3.x subtheme, FlexSlider 2.x-dev.
all image styles and default thresholds render except for 1382. When Omega kicks in the 1200px grid (meaning the browser window is at least 1220px wide), and the browser window is > 1382 px, the 992 image style is still being rendered.
My attempt at a workaround: Created new image styles and set custom thresholds:
image_style[size]:threshold set @ admin/config/media/ais =>240:360, 480:480, 768:768, 1024:1024, 1200:1200.
One thing I noticed, when first enabling (ticking the "selected" box for the style @ admin/config/media/ais) for my custom image styles, the module pre-populates a threshold that is different than the image style size. EX: 240:360, 480:500, 768:800, 1024:1200, 1200:1440. Keeping these "default" thresholds or making them correspond (480:480, 768:768, 1024:1024, 1200:1200) doesn't "fix" the issue.
When the browser window ($(window).width();) is well above the threshold size for 1024 [or 1382 for default ais_image_style] the images are not being replaced.
Screenshot: http://d.pr/i/2Ijc : Custom imagecache_actions text overlay that displays the preset name on the image [not to mention you can tell because the image is "blurry" as it's been scaled up by FlexSlider] so you know which style is loaded.
Dev URL: http://cndemo.dev4.webenabled.net
I was initially thinking that only the first three image_styles set with a threshold were being rendered. I disabled threshold-480, expecting that 1382 would then work, but it didn't. I will be doing a demo presentation at a meetup group in Chicago tonight, and while I'll still be showing how AIS "works" with responsive slideshows like Flexslider, it is not working 100% or as fully intended.
Please, lets fix this bug, as the ais module is invaluable and has the simplest UI for my Drupal-savvy clients.